Here, I have made an F1 style car on TINKERCAD, which can be 3D printed. It can be used as a fun little desk toy. This project comes under the "Tinker and Play" category under the "Tinkercad Student Design" contest.

Supplies

1) A TINKERCAD account

2) A lot of patience

3) 3D printer (if you wish to 3D print)

Step 1: Start Tinkercad

First, open TINKERCAD on your browser and create an account(top right corner) or login if you already have an account. Then, click on "create new design". This will take you to the Workspace where you can start working on your exiting new project!

Step 2: Making the Nose Cone

First, we start by taking a simple cone from the library on the left. To do that, we click on the cone from the library at the left and simply drag it to bring it to our workplane. Then, extend the cone by clicking on it and dragging the required dimension as shown in the second picture. Click on the picture to enlarge it to see better.

Step 3: Making Front Wing

In the second part, we ad a simple wedge and place it on the side of the cone. Then, turn the wedge(to turn, click on the wedge and options will appear. Hover your cursor over the options and you will come to know how each and every feature works) as shown in the second picture. The cone basically forms the nose of our car, and the wedge forms our front wing.

Step 4: Modifying Front Wing

Extend the wedge and make some changes to its height and width as per your requirement, note that you can make this car the way you like.

Step 5: Finishing Front Wing and Making Sidepods

Duplicate the front wing using the Ctrl+D command and then make its width extremely small, and make its other dimensions slightly larger to make the endplate of the front wing. Now duplicate the endplate of one side and drag it to the other side. The front wing is now finished. Now add a box and fillet it from all sides to the radius you like. The dimensions of the box are based on how wide you want to make your sidepods.

Step 6: Making Tail Section

Now, duplicate the nose cone and turn it around, 180 degrees. You can do this by clicking on the cone and the icon will appear over it. By doing this, you will get a cone identical to the first one, but pointing the other side. Decrease its length to make the tail section of the car, as shown in the figure. Also, give colors to parts as per your liking.

Step 7: Making Cavity for Seat and Rear Wing

Now, add two transparent boxes as shown in the figure, which will make our seat cavity and cavity for the rear wing.

Step 8: Making Support for Rear Wing

Make a box near the tail section for the mounting of the rear wing.

Step 9: Removing Excess Material

Make a big transparent box as shown in the figure. Make it big enough to cover the entire car and place it below the work plane. Now select all parts using the shift key(alternatively, you can click and drag to select parts), and group all the parts together. You will find the "group" option to the top right of the working area, right next to the parts library. Hover your cursor over the options there and you will find the correct one. (Tick the "multicolor" option so the parts won't lose their individual color). This will remove the excess material below the work plane and our car body is almost ready now.

Step 10: Making Rear Wing

Make a small wedge or a box on the support for rear wing and then using the "wedge" tool, make a rear wing(just like the front wing).

Step 11: Making Endplates for Rear Wing

Duplicate the rear wing and drag it away from the car. Then, reduce its length as shown in the figure and then make a box near it.

Step 12: Making Endplates for Rear Wing Part 2

Use the "mirror" feature to turn the small wedge upside down. Make the box of same thickness and length as the wedge and place the wedge over the box. Use the "align" and "group" feature to effectively make them one part.(You will find the "align" feature at the top right of the working area next to the "group" feature) Your endplate is ready. Now use "duplicate" feature and complete the rear wing.

Step 13: Making Axles/Suspension

Make a cylinder of long length and small radius to make an axle. Place the axle where you want the position of front wheels to be. Turn the axle 5 degrees in the Z and X directions. Then use "duplicate" and "mirror" three times to make the double wishbones, as shown in the figure.

Step 14: Making Wheels

Now, to make the wheels, make a cylinder and maximize its "bevel", "sides", and "segments". This will make it look like a tyre from an F1 car. Change the thickness according to your liking. Now, use the "duplicate" feature and make a smaller cylinder inside the tyre to make the wheel/rim. Increase its thickness slightly to make it extrude from the wheels. Select the wheel and tyre using the shift key and group them. Now place the wheel on the double wishbones of the suspension and duplicate and drag to make the wheel of other side.

Step 15: Making Suspension and Wheels of Rear Side

Group the double wishbones and the wheels and duplicate them to create the rear wheels and suspension assembly.

Step 16: Making Seat

Make a box of low height and fillet it from al sides to make it smooth like a pillow. Drag it into the seat cavity. Duplicate and rotate it to make the back rest. Make some changes to the dimension. Make sure that seat cusion does not come out from the bottom of the car.

Step 17: Making Bargeboards

Take a cone and make it parabolic to make it look like a bargeboard. Also, like we did earlier, make a transparent box below the workplane and then group it with the cone we made in order to remove the excess cone that extrudes out of the car's underbody. Now, use the "align" option to align all the different parts about the center.